Re: Still confuse with return
James wrote:
- 2) Returning a type other than the declared value for the return type:
- for exaple, the function:
-
- int foo()
- {
-float y;
-
-return y;
- }
-
- would generate an error because it's retuurning type float where an int is
expected.
-
-This won't generate an error (unless your compiler is seriously
-broken). The return value will be silently converted to an int.
gcc -Wall would point out (and 'fix') this wouldn't it?
No. There's nothing that warrants a warning, or needs to be fixed.
Implicit casts between numeric types are perfectly valid.
--
Glynn Clements [EMAIL PROTECTED]
Global variables
Hi! Please tell me how to use global variables! I am using a program which in which I define a variable before the main function so that the functions after it can access and change it. But the changes I make to the global (??) variable aren't refrected in the main part of the program. I have tried the static identifier tag as well, but it doesn't work out. Please help. Thanx! Regards, Ravindra Jaju
Re: Global variables
Ravindra Jaju wrote: Please tell me how to use global variables! At one time, I would have taken it for granted that a question such as this had to be a joke. Nowadays I just wonder how long it's going to be before people start posting to mailing lists with questions like `How do I turn my computer on?' -- Glynn Clements [EMAIL PROTECTED]
Re: Global variables
As u havent included any example I would suppose the situation is as
follows:
///
int global;
void do_change(int x, int y)
{
x = y;
return;
}
int main()
{
...
do_change(global,100);
...
/* oops global is still unchanged = 0 */
}
/
Am I right? If so just change do_change to
void do_change(int* x, int y)
{
*x = y;
return;
}
and call it with
do_change(global,100);
...in the first example parameter X is passed by value (i.e. your function
works with a local copy of the actual object) so the global variable is
still unchanged after the execution
Regards,
Marin
-Original Message-
From: Ravindra Jaju [EMAIL PROTECTED]
To: Linux C Programming [EMAIL PROTECTED]
Date: 05 Ñåïòåìâðè 1998 ã. 20:37
Subject: Global variables
Hi!
Please tell me how to use global variables!
I am using a program which in which I define a variable before the main
function so that the functions after it can access and change it.
But the changes I make to the global (??) variable aren't refrected in the
main part of the program.
I have tried the static identifier tag as well, but it doesn't work out.
Please help.
Thanx!
Regards,
Ravindra Jaju
